Internal-combustion engine



FIG. 1 is a first perspective view of an internal-combustion engine,showing our new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a third perspective view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a right side elevation view thereof; and,

FIG. 9 is a left side elevation view thereof.

The broken lines are for illustrative purposes only and form no part ofthe claimed design.

The ornamental design for, an internal-combustion engine, as shown anddescribed.